![]() They have selected terarylenes because of their reversibility, meaning that the molecule can be converted back to the starting blue isoform upon exposure to ultraviolet light allowing for the system to be reset for repeated use. To increase the quantum yield of terarylenes is to maximize the number of changes that can be induced by a single photon. It was one to one in 2011 and today it becomes 33 molecules per one photon," he says. "We have steadily improved the number of molecules that can undergo photoconversion in response to one photon. Kawai is an expert at increasing the photoconversion efficiency of photoreactive molecules, having focused his attention primarily on terarylenes, organic molecules with which his research team has consistently achieved exceptionally high reaction efficiencies. Ideally, safety management systems want about one hundred times more sensitivity," he says. "Current materials for wearable detectors are sensitive to about 1 Gy. However, NAIST Professor Tsuyoshi Kawai stresses that these badges do not completely eliminate the risk. Similarly, workers at risk of X-ray radiation exposure are required to wear monitoring badges that indicate dangerous levels through changes in photoreactive materials. Some of these materials are also used in eye-protection, e.g., sunglasses that can reduce UV exposure by changing the lens color. Photoreactive materials convert light input into chemical output and are standard in semiconductor and 3-D printing technologies. ![]()
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